scott mac lower unit

[cwalker]

HELP! I have a 12hp scott mac, I’m resealing the lower unit. I was not aware that it has 2 impellers, and I can’t get the impeller cup out of the lower unit housing. Any ideas or methods would be great! Thanks. scott.

[dave-bernard]

one of the impellers is for the pump and one is for the bail-a-matic. I don’t know which one is for which. been about 45 yrs since I worked on them.

[retiredoz]

Are you sure it’s supposed to come out ? It doesn’t show up as an item on my parts list. The parts list simply refers to the lower unit housing as the ‘pump housing assembly’.
The top pump is the bailer.

[frankr]

Some of the Scott liner cups were permanently installed with some kind of epoxy-like sealer to keep the water out from between the cup and aluminum housing. They had a big problem with electrolysis corrosion buildup which would bulge and destroy the liner.

[cwalker]

When I try to pull out the driveshaft it comes up so far and it’s like something is hitting on the bottom of the cup.

[Tom]

Is the bailer pump housing still in place? If so, it might be the drive pin for the water pump impeller hitting the bottom of the bailer impeller housing.

T

[retiredoz]

The drawing refers to the top of the gear housing as the ‘pump housing assembly’. Leave the driveshaft in place and slide every thing up ?
This motor has the shift assembly setup on the drive shaft, not the prop shaft.

[retiredoz]

Sent you a couple emails..

[Author]

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